The aim of this study was to determine the effects of chemical precipitation and addition of external carbonsources on the denitrification capability and enhanced biological phosphorus removal (EBPR) interactions atthe 'Wschod' WWTP (600,000 PE) in Gdansk (northern Poland). For this purpose, different kinds of batch experimentswere carried out with the settled wastewater (without pretreatment and after coagulation-flocculation)and external carbon sources (ethanol and fusel oil). Precipitation of colloidal and particulate organic fractionshas a significant effect on denitrification and EBPR. The removal of these two fractions by coagulation-flocculationresulted in the reduced process rates (30-70%). The experimental investigations were supported by both labscaleand full-scale simulations using a newly developed model as an expansion of the Activated SludgeModel No. 2d (ASM2d). The new model accurately predicted the effects of precipitation and external carbonaddition in batch experiments. Full-scale simulations revealed that addition of external carbon source can compensatethe effects of precipitation resulting in a similar NO3-N behavior compared to the reference case (withoutprecipitation and external carbon addition). The combined effects of precipitation and addition of external carbonsource resulted in a significantly different PO4-P behavior compared to the reference case.
Authors
Additional information
- Category
- Publikacja w czasopiśmie
- Type
- artykuły w czasopismach
- Language
- angielski
- Publication year
- 2012
